ITU-R S 1593-2002 Methodology for frequency sharing between certain types of homogeneous highly-elliptical orbit non-geostationary fixed-satellite service systems in the 4 6 GHz an.pdf
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1、 Rec. ITU-R S.1593 1 RECOMMENDATION ITU-R S.1593 Methodology for frequency sharing between certain types of homogeneous highly-elliptical orbit non-geostationary fixed-satellite service systems in the 4/6 GHz and 11/14 GHz frequency bands (Question ITU-R 231/4) (2002) The ITU Radiocommunication Asse
2、mbly, considering a) that many fixed-satellite service (FSS) frequency bands may be used for both geostationary (GSO) and non-GSO satellite networks according to the Radio Regulations; b) that the technology advances necessary to allow the implementation of non-GSO FSS satellite systems capable of p
3、roviding regional or worldwide service to small earth stations in a cost-effective manner are becoming available; c) that some non-GSO FSS systems are not designed to employ the interference mitigation technique of satellite diversity; d) that studies have shown that without the use of interference
4、mitigation techniques, it will be impracticable for large numbers of non-GSO FSS systems to share the same frequency band when the systems are of significantly varying design; e) that studies have shown that multiple non-GSO FSS systems using only the mitigation technique of homogeneous design can s
5、hare with each other in the same frequency bands; f) that for non-GSO FSS systems using a highly-elliptical orbit (HEO) design, the implementation of satellite diversity comes at a design cost and complexity that may make its use by such systems in sharing with other types of non-GSO FSS systems dif
6、ficult; g) that multiple non-GSO FSS systems that operate in the 11/14 GHz and 4/6 GHz bands using an HEO design (e.g. USAKUS2 as described in Recommendation ITU-R S.1328) can employ geometric mitigation techniques to share with each other by several methods of satellite separation, including interl
7、eaving of satellites within orbital planes, recommends 1 that in the 4/6 GHz and 11/14 GHz bands, the methodology presented in Annex 1 be used to perform analysis of frequency sharing between co-frequency, co-directional non-GSO FSS satellite systems of homogeneous sub-geosynchronous HEO design, i.e
8、. the apogees, perigees, and inclinations of the systems are identical. NOTE 1 The methodology in Annex 1 may also be applicable to other types of non-GSO FSS systems. To determine whether the sharing prospects are different between multiple homogeneous non-GSO FSS systems of the type considered in
9、Annex 1 and inhomogeneous non-GSO FSS systems, further study is required. 2 Rec. ITU-R S.1593 ANNEX 1 Methodology for sharing between certain types of homogeneous HEO non-GSO FSS systems in the 4/6 GHz and 11/14 GHz frequency bands 1 Introduction The methodology presented in this Annex addresses sha
10、ring between certain types of homogeneous non-GSO FSS systems in the 4/6 GHz and 11/14 GHz frequency bands. This approach applies to systems that have homogeneous orbits; i.e. the apogee, perigee, and inclination are identical. The systems must have exactly the same ground tracks for the active port
11、ions of their orbits. The difference will come in the phasing of the satellites in the orbital track. The methodology applies to systems that are designed such that the portions of the orbit in which the satellites are either transmitting or receiving (active arcs) do not cross each other. The appro
12、ach involves the interleaving of satellites within the same orbital ground track when sharing between multiple non-GSO FSS systems. It is applicable generally to non-GSO systems that employ HEO in which the satellites are only transmitting or receiving in a certain portion of the orbit. However, it
13、may be applicable to other non-GSO systems provided that the active portions of the orbit do not cross each other. This approach eliminates in-line interference events since the active arcs do not cross. This means that there will be no need for complicated switching strategies in order to avoid in-
14、line interference events and there will be no need to know the exact locations of the satellites in other constellations as they will be phased in such a way that there will always be a minimum separation between two satellites in adjacent systems. Appendix 1 to this Annex contains an example appli-
15、cation of this methodology. 2 Description of methodology The following Steps comprise this methodology: Step 1: Select a minimum true anomaly separation angle between satellites in adjacent constellations. This is the satellite separation angle between adjacent satellites in two constellations near
16、apogee, when the satellites in adjacent constellations will be the closest to each other. At other locations in the active arc (or during any other portion of the orbit), satellites in adjacent systems will be further separated. The approach taken here is to select a minimum true anomaly separation
17、angle between two satellites that are in adjacent constellations around the apogee. Since the apogee point is when the satellites are travelling at the slowest rate of speed, if the satellites in adjacent constellations are placed symmetrically around the apogee, this will be when the satellites wou
18、ld be closest to each other. Thus, the apogee will be chosen as the centre true anomaly and the true anomalies of the satellites in the two constellations will be equal to the true anomaly at apogee plus one-half the minimum true anomaly separation angle and the true anomaly at apogee minus one-half
19、 the minimum true anomaly separation angle. The resultant true anomalies (E) for the two satellites are given in equations (1) and (2): 2)(1angleSeparationapogeeEE += degrees (1) Rec. ITU-R S.1593 3 2)(2angleSeparationapogeeEE = degrees (2) Step 2: Determine the orbital locations (latitude, longitud
20、e and altitude) of the satellites that are located at the minimum true anomaly separation. From the values for the true anomalies and the other orbital parameters for the system, it is then possible to calculate the eccentric anomaly (Ee), mean anomaly (Em) and time (t) (relative to the time of the
21、ascending node). From these values, it is possible to calculate the latitude, longitude and orbital altitude of the two satellites. The relevant equations for these calculations are as follows: +=eeEEe112tantan21degrees (3) where e is the eccentricity of the orbit. eemEeEE sin= degrees*(4) ()amamtEE
22、Tt +=360s (5) where: T : period of the orbit Ema: mean anomaly at the ascending node time, ta. )()(tan)cos(tan1aepttEilong +=degrees (6) where: i : inclination angle of the orbit (degrees) p:argument of perigee of the orbit (degrees) : longitude of the ascending node of the orbit (degrees) e: rotati
23、on rate of the Earth (degrees/s) ()sin()sin(sin1Eilatpgeocentric+=degrees (7) The latitude calculated in equation (7) is the geocentric latitude. The geographical latitude can be derived from the geocentric latitude by using the formula in equation (8). ()=)tan(11tan21geocentricalgeographiclatJlat d
24、egrees (8) whereJ is the factor for the Earths oblateness. _ *The solution to this equation has been developed using a trigonometric series developed by Lagrange. 4 Rec. ITU-R S.1593 ()eeREeAltitude = )cos(1 km (9) where: : semi-major axis of the orbit (km) Re: radius of the Earth (km). Step 3 : Det
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